Clang >= 18 supports Modified Condition/Decision Coverage (MC/DC).
This patch enables the detection and usage of this feature when
compiling Xen with Clang.
- Update detection logic in Kconfig to check for the required set of
Clang flags for MC/DC:
'-fprofile-instr-generate -fcoverage-mapping -fcoverage-mcdc'.
This bundle is necessary because '-fcoverage-mcdc' requires
'-fcoverage-mapping', which in turn requires '-fprofile-instr-generate'.
- Update llvm.c to handle the profile format changes (bitmap section)
required for MC/DC.
- Guard -Wno-error=coverage-too-many-conditions with CONFIG_CC_IS_GCC
to avoid passing a GCC-only warning option to Clang
Signed-off-by: Saman Dehghan <samaan.dehghan@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
This change enables compatibility for measuring code coverage
with Clang versions 11 through 20 by supporting their respective raw
profile formats.
1- Added support for LLVM raw profile versions 5, 6, 7, 8, 9, and 10.
2- Initialized llvm_profile_header for all versions based on llvm source
code in compiler-rt/include/profile/InstrProfData.inc for each version.
3- We tested this patch for all Clang versions from 11 through 20
on x86 platform.
4- Fixed linking warnings related to LLVM profile sections in x86.
Signed-off-by: Saman Dehghan <samaan.dehghan@gmail.com>
Release-Acked-By: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Tested-by: Wentao Zhang <wentaoz5@illinois.edu>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Saman Dehghan